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            <h2 class="title" style="clear: both"><a id="returns"></a>Error Returns</h2>
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      <p>
        <span>In addition to exceptions, the</span>
        
        DB interfaces always return a value of 0 on success. If the
        operation does not succeed for any reason, the return value will be
        non-zero.
    </p>
      <p>
        If a system error occurred (for example, DB ran out of disk
        space, or permission to access a file was denied, or an illegal argument
        was specified to one of the interfaces), DB returns an
        <code class="literal">errno</code>
        value. All of the possible values of <code class="literal">errno</code> are greater than 0.
    </p>
      <p>
        If the operation did not fail due to a system error, but was not
        successful either, DB returns a special error value. For
        example, if you tried to retrieve data from the database and the
        record for which you are searching does not exist, DB would return
        <code class="literal">DB_NOTFOUND</code>, a special error value that means the requested
        key does not appear in the database. All of the possible special error
        values are less than 0.
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